RadioButton value save into  Database in ASP.Net using C# 

 <table border="0" cellpadding="0" cellspacing="0">  
   <tr>  
     <td>  
       Name:  
     </td>  
     <td>  
       <asp:TextBox ID="txtName" runat="server" />  
     </td>  
   </tr>  
   <tr>  
     <td>  
       Gender:  
     </td>  
     <td>  
       <asp:RadioButton ID="rbMale" Text="Male" runat="server" GroupName="Gender" />  
       <asp:RadioButton ID="rbFemale" Text="Female" runat="server" GroupName="Gender" />  
     </td>  
   </tr>  
   <tr>  
     <td>  
     </td>  
     <td>  
       <asp:Button Text="Submit" runat="server" OnClick="Submit" />  
     </td>  
   </tr>  
 </table>  

 protected void Submit(object sender, EventArgs e)  
 {  
   string name = txtName.Text.Trim();  
   string gender = string.Empty;  
   if (rbMale.Checked)  
   {  
     gender = "M";  
   }  
   else if (rbFemale.Checked)  
   {  
     gender = "F";  
   }  
   string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;  
   using (SqlConnection con = new SqlConnection(constr))  
   {  
     using (SqlCommand cmd = new SqlCommand("INSERT INTO Persons(Name, Gender) VALUES(@Name, @Gender)"))  
     {  
       cmd.Connection = con;  
       cmd.Parameters.AddWithValue("@Name", name);  
       cmd.Parameters.AddWithValue("@Gender", gender);  
       con.Open();  
       cmd.ExecuteNonQuery();  
       con.Close();  
     }  
   }  
 }